I am running an 18-channel UHF wireless system with 2 UA845 distribution amplifiers. Feeding the UA845 are the two standard issue rubber-ducky antennas each with an UA830 amplifiers (switched to +10db boost). We are running 9913 with BNC connectors from the UA830's to the UA845's. My question is how much length can we run before signal loss is a concern? Also, is 9913 the best for this application, or should we consider hardline? Thanks for everything!
Belden 9913 (RG-8/U) is the best 50 Ohm cable commercially available for remoting antennas. At 800 MHz, it has a loss of only 4 dB per 100 feet. By using 9913 with no antenna booster, you could run almost 100 ft. of cable with only 4 dB of loss. Using a 10 dB (UA830) antenna booster, you could run 200 to 250 ft of cable. Make sure the booster is located at the antenna and not at the receiver. Keep in mind that too much signal boost with such low loss cable could cause the RF signal strength to overload the RF input of the receiver and cause drop outs. If you are running less than 100 ft of 9913 cable, you should use the UA830 in the +3 dB position.